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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dec1275b4905a33e126857c719def19beccd69b7d7bd05dcbf078ec592aa059' 
  AND token = 'QgJ2ILwQBCfW6GHbQQLBTo2HdP/KyLCWDx4hdiyHwI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}